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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6761d115c1d16169e0569082e6dc663b985f1cfdcee0036ffdead9b799d33ee1' 
  AND token = 'Z5HZMb1mJvGVxKmxYCEbl1QweVsLP6gyffL9YBqJzmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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