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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0540596698b6e455cebfec37e9d2cf8bb72b4a2748297bff1790cfa7f5d867a' 
  AND token = '93pcV1S33t6aAemrIihJWvfpEA2h/K5TBkl0C21Jg2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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