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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75fdd8e66ea56401336c5204c61bf6b908c4eb3b74f9b3bff4996303666daf79' 
  AND token = 'bP6KXPiKK1a5g01G59BFgw4S5/XM4jVvnM36oPbXzm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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