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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026f26c6a1af8037c8db663587b275ac95894ca346547a946f2fda324400c5ee' 
  AND token = 'qenKH1MH+dps+DQF1gtMxNGDopF3LEvuGCq5t4D+Fcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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