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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2774d354227b0fa0e890f0447cdab3c47020ec0534f99efad23dd06d134a8bb9' 
  AND token = 'qeTt1CmrUUN7xJL2D+m7V5owPbei3GcWnNSpYFIJmjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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