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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debef9e6e247b7f24e15246cc0b4211b341fdae0dfa819db3deb23916b267ab6' 
  AND token = '5Pdlz6/WiVNWJmOux7DKnSSukPIYT34KezeHj0Cn8JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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