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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc2447168f4696d61ae3dc111df4f4c348ad54e8a471603eb49ee02918648ce' 
  AND token = 'r+nujiUQ7ILAMZeKRcFwMD5t5gS5EXJnKgWGpBEah+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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