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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f7aba82fcf66cf05ab4d3bc0a1ad151059f6ac6511ee61ee4f9178ffecf537' 
  AND token = 'KndWgxLtC8TP0qBQm/gCPUT2HOrU6fsGWciHH8w1mFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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