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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c6e4d7ef36768eb494e35130e8ee49d256e042be26d1eeacb3a50f8b9919e6' 
  AND token = '75SDCErsVwDk3tVD0jPdtktsFoCHtgpR5psK99d7i9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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