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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '200c82ce879928101e74052bf8b8702709343a25a991afc341f2c05696fdba1d' 
  AND token = 'gTPM2av7d9Z2SqPV5wBpG2TSf/nvaOuA95W/F0Bahhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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