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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20a0dd810dd32e6090fb5c5cf758e726d28a4b1da36a7347fa015cfa5683af3' 
  AND token = '3WywrsOqeuOGUKg2J7S71SPxdBtoRM44K9qzWzdj6uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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