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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09af625389b0750cb55f38b3640072956fcaf2b947c8a07803804b575395b3c1' 
  AND token = '2v8+tJlVHjLiI/29EleunObLR9iJ0wBGaki7e0Bd04A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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