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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687a15143bad01792aff40b82677f14419859a6da88ba93fde55ce1cc317251b' 
  AND token = 'R8mj+AQe0DiBCEmPIVVzy8feudaM/gN3Z8sW5udRKow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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