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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f926861d5013d57d5ac2e0cb2d503bca3fea614b6301ee614151b1bbe7d27ba6' 
  AND token = 'ALm2Mswymfj3TS+v3X2FS/iY09fC4okX8ydGolkQaQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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