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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51383698a94ed662fb47844ded34d7f857d17c9b66bbb659dc0a42950451c17' 
  AND token = '1Fb0mwqJjhXYo8O6Ol2bNZ38dk9hYyvqxFLgaV187so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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