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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0342ba20f592c482584071c7d9bb8f4b01dfe1454049cc6982abc57c8570bea1' 
  AND token = 'GkfnNjToiLJnrc8mcbg4pjPHRtVYW7D3A3Bv8A85Ok8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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