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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d690a89c07a1acea60b64200ae3005d2d4310a91cdf3f55e75d3441bc923eb6' 
  AND token = 'pe2hGKROsXw5fs6NAkXH1C4q0cz8W2YDTdG/PJpEWJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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