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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0515b5f8ff96b7473307f401c179ea41404ff4dc658093e3a160508a5ada58d3' 
  AND token = 'gJRDETaG7U35PFOBL2rWQm7qCpk27lWiRdwnpeXyuic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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