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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7971bf1e38e9029f977bd8b36d4c76026a98280f5188a54950672b3e159ebdef' 
  AND token = 'dPq7JEmNfkFdpZ+57RMrBe//ZlVU6dedfLtGmhD7R1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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