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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c83c7c0b6e14e2920ca9a9bd28d29e7b1c3cde18808b2eaaec06affab30bea' 
  AND token = 'KosBR29nsm8aAsyAEup5ceIl6Bu7EqdJei8rjB+q3w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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