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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e8bab8fc3ff8c93cf8ab91eb7ef1e14e034934e7cf138d0f3c0603475819c4' 
  AND token = 'ijsb4bCYXIDkmf7lnigDXwiANTx23M5NniGXK7LK4q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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