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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3121f492fbec959fb48a505e11a5855fc30240ee7eb0474cb67bfdbab54cc4' 
  AND token = 'E+6b4x1KG0zGgaNxhVvCe74Aih61qOoG3PVMoDwJcc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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