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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e27d0728de3822bd3fac009a80b4a587084808312ee0b50b93f2ec7d9513b9' 
  AND token = 'tfl8IKQPrYkj0Ec4asgxa8zORLbUwogCUSEVqZ+RVLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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