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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb23102cac0b7714bfa9fe5ec7452c15ce41ee72cb5661249d3043f9ae1f90b' 
  AND token = 'MgTZk5MNk9EREkNdxTGbuA7oKSh0gP2CQBFDy6iQoqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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