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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd254692c3d00b7c2210fba0e31f843a3108303539a3b5bddc43ec2fe2c0cc1d1' 
  AND token = 'UjH3Xw0DbCwpuTy3+s0Z6+5iNu81ASPFpS1dLyoKaI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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