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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8fd91766f2ed59c35c39a54524cfbef344b905c5cae85ddb7147f5e96687f6d' 
  AND token = 'cRQxE01IskXa2bPmhEgoCcRZ5WYCotzDLC07kyHmoPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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