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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b608e2a52120e0ea799f4dd0da10f4a4efe0ff7baee9858760fe5b84cff22f98' 
  AND token = '0kQtUqvUHs67qsyAATH+qacn1zyovifNYuyfO7DhIO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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