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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90bcc9d87599903f41fbc3e57de13054fe7ec12158555d281b509ed0db88946' 
  AND token = 'i4cSuFhgfKy05m8z6a1pFHkNPcYKI6gS5RjJk+tp0d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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