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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f3a1edef8b574e617791613c03278ef2f95327efc2cf521b5262eef335db6e' 
  AND token = '1DOFlv2qPWxyR3dlzLUV3PQImcoSmW5+24/eUTCeyEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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