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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17191607389ddd4b5467e169b64a7e68d3f440021f22bc1c45a256d8c02c934c' 
  AND token = 'b4Q3qPs6a9LEworAHeVwVJ0rdhBMRR58mw37+lLZGlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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