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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab4c69342b6dfcbefa6d319cc3cf43e0251ab66b8d275db941e4b712ce4172e' 
  AND token = 'oWuYwku3emciJgeFVSbQPajHWZmf4pv4u1aL8O7gR8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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