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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a1a70fc0fcd0e2cff2b12814926ab6dae50ce7808cffd27ed2c2044e5e61b6' 
  AND token = 'SMRCi0fBTFtD4zbtpSofjB+2LWukZJUnIlxwu8qsNdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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