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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9284c2b61548238f9f3e013fbccc76b6116a99200cd8814341c6f3d2bfbe74' 
  AND token = 'uHTcemcyzhuJKjhEVYp7ypc/Y2XghD5OukW56h9S9v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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