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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef5b11b6a0b4d3e10dc5eeda2b4c72dcf4791f26b55225ce3d283ac357d9d8e' 
  AND token = 'rDujSN63M6AsG/0iPqiQMpy6Z3kLleZpUWAU5csh1jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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