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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32751f275dfe84a39c4809d1d616fee96fa3b2a19fab3ca489a462697f23ee9' 
  AND token = 'eGa3Yp/NKMZ58yL6SYneBjcmd/RHbobB7v00tD6vpz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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