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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c633fbc55a021f110def69940dc63c42d7041be352ef3d9a9496c7958620e5' 
  AND token = 'zcwtmI9Cu6dUvPbaTwRhoAI434/UwUmlhcZoKc7QdYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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