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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7f5153d90a42e1449631a2664f26ea1eab1e5e69a895e55060fad770a4fcbb' 
  AND token = 'R5kLbx2NSniLsQjEYKID1hop0ucXtCdTa8W01mCk2r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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