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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f679cbc0cf96b8b9f9a268b971b10b0ade9219111290e10509d81f0602abbff' 
  AND token = 'aCcZkWOKoj67cUFKpuvFoKaj63bXL4/Myq37o/YMO2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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