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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b0dd6eac0b1bbcab4d0b1a74365cb7330cfb8b4472217d24fc95974584b139' 
  AND token = 'NlJq7WhTVE658K7mi3A08xokdsW3rJuPHFvmrbbeMOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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