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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b51e2c72e08f810ac3c8ee1dc1a831601d88ab3254ce757eef15dd73d5d4d9a' 
  AND token = 'SiKZpI/I3azS20wYP9NjqChhG0bu4zORoG9mOCN3ZNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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