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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983a9c70dc1f86ce1ef07eb183f378709f491af134c21d5e1223ba3543b190b4' 
  AND token = 'GffpbXVehewriy/qzCJxVrIPTqge/MzDUXs+fy4K8d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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