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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396ea4888b26e916306f06a93b16d3266a764f5aaee10b893d5a66e093c1a07b' 
  AND token = '+EqX8QH1ry4o5qNyBl62b/hN9xc4gwK4w1MFgaCwYY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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