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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e698e0dcae0fa560da93dfbe03aabbfd881199eb06ffcf89659bf1e1a77e23f2' 
  AND token = 'gVHl+vu/r7fSW7IIFrqmfCCesYiPqrUn4MTmANtJsYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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