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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e73818be6f353a21809438bf5ac3957a5eb93d33ed3cfe1c2ce34abd4e4ea2b' 
  AND token = 'c40Z3WR5X7XF3HMGoxS1NBrzUQ0SNd7RmHhJze36Alg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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