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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2362f1c87f1a1b42fa0d93c21f2ca026deede48755f8fcb754ac90bcb16d0142' 
  AND token = 'eiXqCV9a5EgJgUIl+VHDtuxHv1DWO9AbqhFkUpO/Q0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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