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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d0a1c235e54338d3dbaa4dac3e52ed27370d29fc7258da3ef9b0164e57a088' 
  AND token = '4y7Jb90hOzcovaNWCDdKSJJW1KFqOBMobNdeSU1+JT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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