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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e12bcecbf646a042c0f0861bea1ab3046f274d8b2f82ef86c3b98d5652d5ee6' 
  AND token = 'fE51j9TuR1kTLk1EwAKNiahMfpbz+zMVxSRxNxmVBIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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