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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b15d448b9f8b0aa9fac9d07446b203be64e4e1d8f32c188916b31898f7effb' 
  AND token = 'JSjvgj2pGwwb6Fe8h3b0lyPipo2wqMVKdNDCPvaDOaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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