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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe3725015281c7ce996bd8a4213c2c1e7c142cd18a7dcb794900f432eaba5f5' 
  AND token = 'pL558jujVSgMisqx9lO2RcLpjoVfOLFh5Ial8CDaA4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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