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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7ffd69810c4e8541d7c326bfe0b2759105e686af8bdb3962d98e3b63873f20' 
  AND token = '7f61Dx2Rt7jvgq4GUggac1gG8tu1GfT/9VCaQu3t9Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}