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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6031b2d6d49a1c0a029feaf7a9b7d087523e478dfc1a5c92cd1496db2156c8' 
  AND token = 'PZ56tSSPcZvg1VmhAlniZ5MRHoccXeNOWKPWTtUMaHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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