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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99d94276b3993278accc64b0e2e5ddcaf7cf3c13a0ce9d498be492ef984e6c5' 
  AND token = 'obT961F1iz9JIWrPIEF3FpXhjI8ugQZQA6nAH2EHLMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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