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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1869a2d1afd07e17e48c8da9f8a3fd5c0f7f8a7d2a4d4a92ef942a25c2cf63' 
  AND token = '23N9EytUvs/iHAL/jJHPiZvd7uO5K7Nxz1bAsDA4RbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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