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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef2869c3d5e505214182f862cdbe428b3eb1a86070e18374736c1e37a7b5055' 
  AND token = 'KW3Q+8CezT1Mxy34+QddeIxDILVtNKnusQi/rUXFZQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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