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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9906137aef02692d49fcd7f5ae18fcf3ab004ba59986cf4f677d22d6fa1c8e36' 
  AND token = 'vsF7ROizHUU6wJpIi2sb3eHPARBVIcbSMOO9fj1AhJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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